Table header section click problem

Greetings.

I have an unusual problem, and i dont know where to look for the cause.
I am using Qt 4.4.0 beta.

I have a view derived from treeview, and a model derived from abstract table model.
The problem is, occasionally, when i click on a horizontal header section, for sorting purposes, the entire view jumps away, furthermore, by debugging, it shows that it initializes the sorting with an entirely different column number, that the one i clicked on. There are no logicalIndex, visualIndex issues, because at startup the columns are not reorganized.

I don't know what could be causing this.

Any ideas?

Thanks.